US 12,326,482 B2
Magnetic system for counting rotations having increased stability against magnetic interference fields
Roland Matteis, Jena (DE)
Assigned to Horst Siedle GmbH & Co. KG, Furtwangen (DE); and Leibniz-Institut Fuer Photonische Technologien e.V., Jena (DE)
Appl. No. 18/032,522
Filed by Leibniz-Institut Fuer Photonische Technologien E.V., Jena (DE); and Horst Siedle GmbH & Co. KG, Furtwangen (DE)
PCT Filed Nov. 2, 2021, PCT No. PCT/DE2021/000185
§ 371(c)(1), (2) Date Apr. 18, 2023,
PCT Pub. No. WO2022/096050, PCT Pub. Date May 12, 2022.
Claims priority of application No. 10 2020 006 987.8 (DE), filed on Nov. 9, 2020.
Prior Publication US 2023/0384399 A1, Nov. 30, 2023
Int. Cl. G01R 33/00 (2006.01); G01D 5/14 (2006.01); G01R 33/09 (2006.01)
CPC G01R 33/0005 (2013.01) [G01D 5/145 (2013.01); G01R 33/093 (2013.01); G01R 33/098 (2013.01); G01D 2205/20 (2021.05)] 9 Claims
OG exemplary drawing
 
1. A magnetic system for counting revolutions having increased magnetic interference field immunity, comprising an angle sensor configured to determine a field direction of a magnetic field of a permanent magnet which jointly captures the angle sensor and a revolution counter, the revolution counter being formed by a GMR or TMR revolution counter, and the angle sensor and the revolution counter being disposed next to one another in a shared enclosure and/or on a shared printed circuit board, wherein a magnetic damping structure not made of a homogeneous soft magnetic material and configured to adapt magnetic action thereof is assigned to the revolution counter, the damping structure having no, or only a negligibly small, magnetic field of its own at an external magnetic field of zero, and wherein the damping structure comprises a plurality of regions oriented in a magnetically anti-parallel configuration or in a magnetically disordered configuration.